CRTC pins RA3 and RA4 are not connected on CPC.
== CUDISP == CUDISP signal defines the hardware cursor. CRTC pin CUDISP is not connected to the Gate Array, but so it has no effect on a barebone CPC or Plus machine. However, this signal is present on the expansion port (and . And it is used by the [[PlayCity]] and [[Play2CPC]] expansions).
== DISPTMG ==
=== ASIC/Pre-ASIC and R10/R11 ===
The cursor raster registers R10/R11 act as status registers when read on Types 3 & 4.
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* [[Media:Dossier CRTC(Ramlaid Mortel).pdf]] Les entrailles du CRTC
* [https://thecheshirec.at/tag/crtc6845/ Leçons CRTC (CheshireCat)]
* [[Media:ACCC1.78-EN.pdf]] [[Media:ACCC1.78-FR.pdf]] CPC CRTC Compendium - Latest (1004/20232024!) document containing in-depth info about CRTC programming on CPC.
==Related pages==